"He was tired of dealing with the government," said Kristi Suthamtewkal, spouse of the owner of a Fort Worth restaurant Alexis once frequented.

In a statement, Alexis' mother expressed sadness for the families of the victims and expressed that she was "glad" he could no longer hurt anyone else.

"His actions have had a profound and everlasting effect on the families of the victims," Cathleen Alexis said in a statement on Wednesday, NBC News reported. "I don't know why he did what he did, and I'll never be able to ask him why. Aaron is now in a place where he can no longer do harm to anyone, and for that I am glad."

As investigators continue to assess what happened, at least one union representative blamed management for understaffing the police force.

Anthony Meely, chairman of the Fraternal Order of Police Naval District Labor Committee, stated that 11 Navy police officers were supposed work at the Navy Yard Monday, but only seven were at the site because of cutbacks.

"People died because of management rights, the right to make a decision to save money," said Meely, as reported by USA Today.